摘要：
题目：A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep co... 阅读全文
摘要：
题目：Determine if a Sudoku is valid, according to:Sudoku Puzzles - The Rules.The Sudoku board could be partially filled, where empty cells are filled wi... 阅读全文